Author: Dieter Hardock
Building envelope thermal performance is greatly affected by thermal bridging, or localized areas of increased heat flow through walls and roofs. Mitigating the impact of thermal bridging is not only necessary to reduce energy consumption but is also an important consideration for minimizing the risk of condensation on cold surfaces and for maintaining occupant comfort.
As part of new Building Envelope Thermal Bridging (BETB) Guide, various construction details have been analyzed to evaluate traditional thermal bridges and various solutions provided by Schöck Isokorb. Please find the report here.
Cantilevered balconies are common in residential structures, yet their traditional design is a slab of continuous concrete passing through the building envelope. This concrete slab balcony creates one of the most significant thermal bridges with excessive heat loss.
As buildings improve with higher performance walls and windows, the amount of heat loss at the balcony slab is increased. Therefore, designers are looking for solutions to thermally separate the interior slab from the exterior balcony slab.
From a structural point of view, balconies have to resist several loadings conditions like permanent loadings (dead load), variable loadings (live loads, wind loads, snow loads) and rare loadings resulting from earthquakes. Seismic considerations could have a relevant influence on the design of buildings depending on the geographic location of the building (seismic hazard), soil characteristic, stiffness and weight of the building, the assemblies and so on. … read more
Steel beams which penetrate the exterior wall (and break the continuous insulation layer) represent a detrimental thermal bridge in the building envelope. This situation often occurs in the structural details when a continuous steel canopy or balcony beam cantilevers out from the interior structure.
This penetration to the continuous insulation (CI) layer, is being further considered and addressed in energy building codes such as the ASHRAE 189.1 and 90.1 and the International Green Construction Code (IGCC), which guides codes and standards for both baseline and high-performance green buildings.
Since steel is a highly conductive material (k=50W/mK) / (R-0.003 per inch), a thermal break solution is necessary to reduce energy loss, prevent condensation on the surface, and avoid damaging results to the building. … read more
On February 13th and 14th Schöck had the great opportunity to present the company and Isokorb structural thermal breaks, at BuildEX 2013 to the construction community in Vancouver, British Columbia.
We experienced great interest at our booth, and found out that most people are aware of the problems and effects of thermal bridging. But not of the solution – Schöck Isokorb® for concrete and steel applications.